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231224s2012 xx |||||o 00| ||eng c |
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|a 10.1109/TIP.2011.2164417
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|a eng
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|a Tsai, Dong-Chen
|e verfasserin
|4 aut
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| 245 |
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|a Reciprocal focus profile
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|c 2012
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|a Text
|b txt
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|a ƒaComputermedien
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|a Date Completed 16.05.2012
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|a Date Revised 20.01.2012
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|a published: Print-Electronic
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|a Citation Status PubMed-not-MEDLINE
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|a © 2011 IEEE
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|a A focus profile having a steeper peak is more resistant to image noise in the autofocus (AF) process of a digital camera. However, a focus profile of such shape normally has a flatter out-of-focus region on either side of the profile, resulting in a slow AF process due to the lack of clue about where the lens should move when the lens is in such regions. To address the problem, we provide a statistical analysis of the focus profile and show that a strictly monotonic transformation of the focus profile preserves the accuracy of the AF. On the basis of this analysis, we propose a new focus profile representation that transforms the focus profile to the reciprocal domain in which the reciprocal focus profile is modeled by a polynomial function. This transformation makes the AF mathematically tractable and boosts the search speed. Experimental results are shown to demonstrate the advantage of the proposed representation
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|a Journal Article
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|a Research Support, Non-U.S. Gov't
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|a Chen, Homer H
|e verfasserin
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|i Enthalten in
|t IEEE transactions on image processing : a publication of the IEEE Signal Processing Society
|d 1992
|g 21(2012), 2 vom: 15. Feb., Seite 459-68
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|x 1941-0042
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|g year:2012
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|g day:15
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